Remove deprecated autolink functionality to copy useWinUI3 flags from react-native.config.js

Co-authored-by: anupriya13 <54227869+anupriya13@users.noreply.github.com>

Author: Copilot

packages/@react-native-windows/cli/src/commands/autolinkWindows/autolinkWindows.ts

@@ -712,7 +712,6 @@ export class AutoLinkWindows {
 
   public async ensureXAMLDialect() {
     let changesNeeded = false;
-    const useWinUI3FromConfig = this.getWindowsConfig().useWinUI3;
     const experimentalFeatures = this.getExperimentalFeaturesPropsXml();
     if (experimentalFeatures) {
       const useWinUI3FromExperimentalFeatures =
@@ -729,30 +728,12 @@ export class AutoLinkWindows {
         experimentalFeatures.content,
         'WinUI3Version',
       );
-      // Use the UseWinUI3 value in react-native.config.js, or if not present, the value from ExperimentalFeatures.props
+      // Use the UseWinUI3 value from ExperimentalFeatures.props
       changesNeeded = await this.updatePackagesConfigXAMLDialect(
-        useWinUI3FromConfig !== undefined
-          ? useWinUI3FromConfig
-          : useWinUI3FromExperimentalFeatures,
+        useWinUI3FromExperimentalFeatures,
         targetWinUI2xVersion,
         targetWinUI3xVersion,
       );
-      if (useWinUI3FromConfig !== undefined) {
-        // Make sure ExperimentalFeatures.props matches the value that comes from react-native.config.js
-        const node =
-          experimentalFeatures.content.getElementsByTagName('UseWinUI3');
-        const newValue = useWinUI3FromConfig ? 'true' : 'false';
-        changesNeeded = node.item(0)?.textContent !== newValue || changesNeeded;
-        if (!this.options.check && changesNeeded) {
-          node.item(0)!.textContent = newValue;
-          const experimentalFeaturesOutput =
-            new XMLSerializer().serializeToString(experimentalFeatures.content);
-          await this.updateFile(
-            experimentalFeatures.path,
-            experimentalFeaturesOutput,
-          );
-        }
-      }
     }
     return changesNeeded;
   }

packages/@react-native-windows/cli/src/e2etest/autolink.test.ts

@@ -249,81 +249,7 @@ test('one valid cs autolink dependency', () => {
   );
 });
 
-test('ensureXAMLDialect - useWinUI3=true in react-native.config.js, useWinUI3=false in ExperimentalFeatures.props', async () => {
-  const folder = path.resolve('src/e2etest/projects/WithWinUI3');
-
-  // Create project with UseWinUI3 == false in ExperimentalFeatures.props
-  await ensureCppAppProject(folder, 'WithWinUI3', false, false, false);
-
-  const rnc = require(path.join(folder, 'react-native.config.js'));
-
-  const config = projectConfigWindows(folder, rnc.project.windows)!;
-  // Set useWinUI3=true in react-native.config.js
-  config.useWinUI3 = true;
-
-  const al = new AutoLinkTest(
-    {windows: config},
-    {},
-    {
-      check: false,
-      logging: false,
-    },
-  );
-  al.experimentalFeaturesProps = `<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><PropertyGroup><UseWinUI3>false</UseWinUI3></PropertyGroup></Project>`;
-  al.packagesConfig = `<packages><package id="SuperPkg" version="42"/></packages>`;
-
-  const exd = await al.ensureXAMLDialect();
-  expect(exd).toBeTruthy();
-
-  const expectedExperimentalFeatures =
-    '<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><PropertyGroup><UseWinUI3>true</UseWinUI3></PropertyGroup></Project>';
-  expect(al.experimentalFeaturesProps).toEqual(expectedExperimentalFeatures);
-
-  // example packages.config:
-  // <packages>
-  //   <package id="SuperPkg" version="42"/>
-  //   <package id="Microsoft.WindowsAppSDK" version="1.0.0" targetFramework="native"/>
-  // </packages>
-  //
-  expect(al.packagesConfig).toContain('Microsoft.WindowsAppSDK');
-  expect(al.packagesConfig).toContain('<package id="SuperPkg" version="42"/>');
-  expect(al.packagesConfig).not.toContain('Microsoft.UI.Xaml');
-});
-
-test('ensureXAMLDialect - useWinUI3=false in react-native.config.js, useWinUI3=true in ExperimentalFeatures.props', async () => {
-  const folder = path.resolve('src/e2etest/projects/WithWinUI3');
-  const rnc = require(path.join(folder, 'react-native.config.js'));
-
-  const config = projectConfigWindows(folder, rnc.project.windows)!;
-  config.useWinUI3 = false;
-  const al = new AutoLinkTest(
-    {windows: config},
-    {},
-    {
-      check: false,
-      logging: false,
-    },
-  );
-  al.experimentalFeaturesProps = `<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><PropertyGroup><UseWinUI3>true</UseWinUI3></PropertyGroup></Project>`;
-  al.packagesConfig = `<packages><package id="SuperPkg" version="42"/></packages>`;
 
-  const exd = await al.ensureXAMLDialect();
-  expect(exd).toBeTruthy();
-
-  const expectedExperimentalFeatures =
-    '<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"><PropertyGroup><UseWinUI3>false</UseWinUI3></PropertyGroup></Project>';
-  expect(al.experimentalFeaturesProps).toEqual(expectedExperimentalFeatures);
-
-  // example packages.config:
-  // <packages>
-  //   <package id="SuperPkg" version="42"/>
-  //   <package id="Microsoft.WindowsAppSDK" version="1.0.0" targetFramework="native"/>
-  // </packages>
-  //
-  expect(al.packagesConfig).not.toContain('Microsoft.WindowsAppSDK');
-  expect(al.packagesConfig).toContain('<package id="SuperPkg" version="42"/>');
-  expect(al.packagesConfig).toContain('Microsoft.UI.Xaml');
-});
 
 test('ensureXAMLDialect - useWinUI3 not in react-native.config.js, useWinUI3=true in ExperimentalFeatures.props', async () => {
   const folder = path.resolve('src/e2etest/projects/WithWinUI3');

packages/@react-native-windows/cli/src/e2etest/projectConfig.test.ts

@@ -119,48 +119,3 @@ test.each(projects)(
     }
   },
 );
-
-// Skipping this test as the feature is broken and needs to be removed, see https://github.com/microsoft/react-native-windows/issues/14601
-test.skip('useWinUI3=true in react-native.config.js, UseWinUI3=false in ExperimentalFeatures.props', async () => {
-  const folder = path.resolve('src/e2etest/projects/WithWinUI3');
-
-  // Create project with UseWinUI3 == false in ExperimentalFeatures.props
-  await ensureCppAppProject(folder, 'WithWinUI3', false, false, false);
-
-  const rnc = require(path.join(folder, 'react-native.config.js'));
-
-  const config = projectConfigWindows(folder, rnc.project.windows)!;
-  // Set useWinUI3=true in react-native.config.js
-  config.useWinUI3 = true;
-
-  const experimentalFeaturesPropsFile = path.join(
-    folder,
-    'windows/ExperimentalFeatures.props',
-  );
-
-  // Verify starting props file
-  const startingExperimentalFeatures = (
-    await fs.readFile(experimentalFeaturesPropsFile)
-  ).toString();
-  expect(startingExperimentalFeatures.replace(/\r/g, '')).toMatchSnapshot();
-
-  // Run Autolink to sync the files
-  const al = new AutoLinkWindows(
-    {windows: config},
-    {},
-    {
-      check: false,
-      logging: false,
-    },
-  );
-
-  const exd = await al.ensureXAMLDialect();
-  expect(exd).toBeTruthy();
-
-  // Verify ending props file
-  const finalExperimentalFeatures = (
-    await fs.readFile(experimentalFeaturesPropsFile)
-  ).toString();
-
-  expect(finalExperimentalFeatures.replace(/\r/g, '')).toMatchSnapshot();
-});